13550420 has 72 divisors (see below), whose sum is σ = 32588640. Its totient is φ = 4717440.

The previous prime is 13550419. The next prime is 13550437. The reversal of 13550420 is 2405531.

13550420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×13550420² = 367227764352800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 13550392 and 13550401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64115 + ... + 64325.

It is an arithmetic number, because the mean of its divisors is an integer number (452620).

Almost surely, 2^13550420 is an apocalyptic number.

13550420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13550420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16294320).

13550420 is an abundant number, since it is smaller than the sum of its proper divisors (19038220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13550420 is a wasteful number, since it uses less digits than its factorization.

13550420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265 (or 250 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 13550420 is about 3681.0895126307. The cubic root of 13550420 is about 238.4062219672.

Adding to 13550420 its reverse (2405531), we get a palindrome (15955951).

The spelling of 13550420 in words is "thirteen million, five hundred fifty thousand, four hundred twenty".